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Diffstat (limited to 'gnu/usr.bin/binutils/gdb/alphaobsd-nat.c')
| -rw-r--r-- | gnu/usr.bin/binutils/gdb/alphaobsd-nat.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/gnu/usr.bin/binutils/gdb/alphaobsd-nat.c b/gnu/usr.bin/binutils/gdb/alphaobsd-nat.c new file mode 100644 index 00000000000..128faa10161 --- /dev/null +++ b/gnu/usr.bin/binutils/gdb/alphaobsd-nat.c @@ -0,0 +1,268 @@ +/* Low level Alpha interface, for GDB when running native. + Copyright 1993, 1995 Free Software Foundation, Inc. + +This file is part of GDB. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include "defs.h" +#include "inferior.h" +#include "gdbcore.h" +#include "target.h" +#include <sys/ptrace.h> +#include <machine/reg.h> +#include <machine/frame.h> +#include <machine/pcb.h> +#include <string.h> + +/* Size of elements in jmpbuf */ + +#define JB_ELEMENT_SIZE 8 + +/* The definition for JB_PC in machine/reg.h is wrong. + And we can't get at the correct definition in setjmp.h as it is + not always available (eg. if _POSIX_SOURCE is defined which is the + default). As the defintion is unlikely to change (see comment + in <setjmp.h>, define the correct value here. */ + +#undef JB_PC +#define JB_PC 2 + +/* Figure out where the longjmp will land. + We expect the first arg to be a pointer to the jmp_buf structure from which + we extract the pc (JB_PC) that we will land at. The pc is copied into PC. + This routine returns true on success. */ + +int +get_longjmp_target (pc) + CORE_ADDR *pc; +{ + CORE_ADDR jb_addr; + char raw_buffer[MAX_REGISTER_RAW_SIZE]; + + jb_addr = read_register(A0_REGNUM); + + if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer, + sizeof(CORE_ADDR))) + return 0; + + *pc = extract_address (raw_buffer, sizeof(CORE_ADDR)); + return 1; +} + +/* Extract the register values out of the core file and store + them where `read_register' will find them. + + CORE_REG_SECT points to the register values themselves, read into memory. + CORE_REG_SIZE is the size of that area. + WHICH says which set of registers we are handling (0 = int, 2 = float + on machines where they are discontiguous). + REG_ADDR is the offset from u.u_ar0 to the register values relative to + core_reg_sect. This is used with old-fashioned core files to + locate the registers in a large upage-plus-stack ".reg" section. + Original upage address X is at location core_reg_sect+x+reg_addr. + */ + +#define oi(name) \ + offsetof(struct md_coredump, md_tf.tf_regs[__CONCAT(FRAME_,name)]) +#define of(num) \ + offsetof(struct md_coredump, md_fpstate.fpr_regs[num]) + +void +fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) + char *core_reg_sect; + unsigned core_reg_size; + int which; + unsigned reg_addr; +{ + register int regno; + register int addr; + int bad_reg = -1; + static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; + int regoff[NUM_REGS] = { + oi(V0), oi(T0), oi(T1), oi(T2), oi(T3), oi(T4), oi(T5), oi(T6), + oi(T7), oi(S0), oi(S1), oi(S2), oi(S3), oi(S4), oi(S5), oi(S6), + oi(A0), oi(A1), oi(A2), oi(A3), oi(A4), oi(A5), oi(T8), oi(T9), + oi(T10), oi(T11), oi(RA), oi(T12), oi(AT), oi(GP), oi(SP), -1, + of(0), of(1), of(2), of(3), of(4), of(5), of(6), of(7), + of(8), of(9), of(10), of(11), of(12), of(13), of(14), of(15), + of(16), of(17), of(18), of(19), of(20), of(21), of(22), of(23), + of(24), of(25), of(26), of(27), of(28), of(29), of(30), of(31), + oi(PC), -1, + }; + + for (regno = 0; regno < NUM_REGS; regno++) + { + if (CANNOT_FETCH_REGISTER (regno)) + { + supply_register (regno, zerobuf); + continue; + } + addr = regoff[regno]; + if (addr < 0 || addr >= core_reg_size) + { + if (bad_reg < 0) + bad_reg = regno; + } + else + { + supply_register (regno, core_reg_sect + addr); + } + } + if (bad_reg >= 0) + { + error ("Register %s not found in core file.", reg_names[bad_reg]); + } +} + +register_t +rrf_to_register(regno, reg, fpreg) + int regno; + struct reg *reg; + struct fpreg *fpreg; +{ + + if (regno < 0) + abort(); + else if (regno < FP0_REGNUM) + return (reg->r_regs[regno]); + else if (regno == PC_REGNUM) + return (reg->r_regs[R_ZERO]); + else if (regno >= FP0_REGNUM) + return (fpreg->fpr_regs[regno - FP0_REGNUM]); + else + abort(); +} + +void +fetch_inferior_registers (regno) + int regno; +{ + struct reg reg; + struct fpreg fpreg; + register_t regval; + static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; + char *rp; + + ptrace(PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE)®, 0); + ptrace(PT_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE)&fpreg, 0); + + if (regno < 0) { + for (regno = 0; regno < NUM_REGS; regno++) { + if (CANNOT_FETCH_REGISTER (regno)) + rp = zerobuf; + else { + regval = rrf_to_register(regno, ®, &fpreg); + rp = (char *)®val; + } + supply_register(regno, rp); + } + } else { + if (CANNOT_FETCH_REGISTER (regno)) + rp = zerobuf; + else { + regval = rrf_to_register(regno, ®, &fpreg); + rp = (char *)®val; + } + + supply_register(regno, rp); + } +} + +void +register_into_rrf(val, regno, reg, fpreg) + register_t val; + int regno; + struct reg *reg; + struct fpreg *fpreg; +{ + + if (regno < 0) + abort(); + else if (regno < FP0_REGNUM) + reg->r_regs[regno] = val; + else if (regno == PC_REGNUM) + reg->r_regs[R_ZERO] = val; + else if (regno >= FP0_REGNUM) + fpreg->fpr_regs[regno - FP0_REGNUM] = val; + else + abort(); +} + +void +store_inferior_registers (regno) + int regno; +{ + struct reg reg; + struct fpreg fpreg; + register_t regval; + + if (regno < 0) { + for (regno = 0; regno < NUM_REGS; regno++) { + if (CANNOT_STORE_REGISTER (regno)) + continue; + + if (REGISTER_RAW_SIZE (regno) != sizeof regval) + abort(); + memcpy(®val, ®isters[REGISTER_BYTE (regno)], + REGISTER_RAW_SIZE (regno)); + register_into_rrf(regval, regno, ®, &fpreg); + } + } else { + ptrace(PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE)®, 0); + ptrace(PT_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE)&fpreg, 0); + + memcpy(®val, ®isters[REGISTER_BYTE (regno)], + REGISTER_RAW_SIZE (regno)); + register_into_rrf(regval, regno, ®, &fpreg); + } + + ptrace(PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE)®, 0); + ptrace(PT_SETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE)&fpreg, 0); +} + +void +child_resume (pid, step, signal) + int pid; + int step; + enum target_signal signal; +{ + + errno = 0; + + if (pid == -1) + /* Resume all threads. */ + /* I think this only gets used in the non-threaded case, where "resume + all threads" and "resume inferior_pid" are the same. */ + pid = inferior_pid; + + /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where + it was. (If GDB wanted it to start some other way, we have already + written a new PC value to the child.) + + If this system does not support PT_STEP, a higher level function will + have called single_step() to transmute the step request into a + continue request (by setting breakpoints on all possible successor + instructions), so we don't have to worry about that here. */ + + if (step) + abort(); + else + ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1, + target_signal_to_host (signal)); + + if (errno) + perror_with_name ("ptrace"); +} |